PAN FIBER/PITCH MATRIX碳－碳複合材料模擬煞車磨耗研究

Simulated-Stop Wear Behavior of PAN FIBER/PITCH MATRIX Carbon-Carbon Composite

李國榮(K. J. Lee) ； 陳瑾惠(J. H. Chem) ； 朱建平(C. P. Ju)

《中國航空太空學會學刊》 27卷2期 (1995/06) Pp. 157-163

https://doi.org/10.6124/TAASRC.199506_27(2).09

摘要

本研究探討PAN/pitch三維碳－碳複合材料在二種不同表面狀態（as-polished及broken-in）及不同轉速（1400及2000rpm）模擬煞車下的磨潤行爲。實驗結果顯示，或因μ值較大（BI試片），或因煞車時間較長（AP試片），不論AP或BI試片，轉速大時，磨耗量也較大。就磨耗面觀察，AP試片經兩種轉速的模擬煞車實驗因尚未發生transition，表面皆較模擬煞車之BI試片光滑，μ值也較穩定。BI試片在高轉速(200rpm)。下煞車時組織破壞較大，磨耗面有嚴重片狀磨屑剝落現象，μ值也較大。對BI/2000分段SEM觀察，可推測當磨耗表面暗帶或亮帶分佈不均時，磨擦係數μ值也較不穩定。粉狀磨耗屑增多時，表面較粗糙，磨擦係數也較大。由µ值，磨耗及磨耗面觀察結果可判斷，在本研究BI/2000的條件下，材料破壞程度過大且不易癒合。

關鍵字

碳－碳複合材料 ； 模擬煞車磨耗

並列摘要

This work studies the simulated-stop (braking) tribological behavior under different surface conditions i.e., as-polished (AP) and broken-in (BI), and different initial speeds (1400 and 2000rmp) of PAN/Pitch carbon-carbon composite. Results indicated that the higher initial speed caused larger weight loss either due to the higher friction coefficient (for BI specimens) or due to the longer braking time (for AP specimens). In the absence of transition, the surface morphology of brake-stopped AP specimens was smoother and the friction coefficient was more stable than the brake-stopped BI specimens. High friction coefficient, severe structural damage and disruption of debris film were observed on the worn surface of BI specimens brake-stopped from 2000rpm. Sequential morphological examination on the BI/2000 specimen indicated that, when the dark and bright bands were distributed non-uniformly, the friction coefficient became unstable. When more powdery debris was formed, the worn surface was rougher and the friction coefficient was higher. The high friction coefficient, high weight loss and severe surface damage inidcated that the braking condition for BI/2000 was practically unacceptable and the disurpted film was hardly to be healed.

並列關鍵字

carbon-carbon composite ； simulated-stop wear